Question about lost and found

Hello. I lost my wallet at the train, but luckily NS found it and returned to me. According to the letter that i received, they found 17euro in my wallet so they will transfer to my account number which i paid shipping costs. But I didn’t pay any shipping cost so do i need to tell my bank account? I want my money back. Also there was my country ID card in wallet, manager said it will go to my country embassy or be destroyed. I want to know what happend to my ID and What should i do to get my ID card back.